Watts ETX-30 Non-Potable Water Carbon Steel Expansion Tank for Closed Loop Hydronic Heating System Piping, 1/2" MNPT Connection, Tank Volume 4.7 Gallons, Maximum Pressure 75 psi

Their tanks are always pretty good. Highly recommend.

Haven't needed to install it yet but when I do, I will have a quality product ready to go at a good price.

Works as expected on my 30 psi boiler system.

Item was as represented.

Easy to install. Better pricing than from the Big Box store.Good quality.

Stores by me do not carry expansion tanks for the cold side of a water tank. Ones the water company put a check valve on the water supplies going into my house the pipes were banging this solved my problem

Perfect Fit and replacement. Purchased the EXT-30 to replace my failed Flextrol expansion tank purchased 12/2020. Apparently the bladder failed, causing my hydronic heating system to increase pressure causing the pressure pop off valve to drip. The old tank was small, 2.1 gallon size. When researching replacements, I accidently ordered the 4.5 gallon. Thankfully it just barely fit. I have three zones and fingers crossed the larger capacity will endure less stress during the repeating thermo cycling. Watts tank is well built, came pre charged at 12 psi. Spun right on 1/2 mnpt connection. Ordered on Monday, delivered Wednesday and 30 minutes later was installed. Pressures have maintained, no leaks, and zero worries. Btw, I called the plumbing supply store where I purchased the Flextrol in 2020, I believe it was less than 100 bucks, wanted a whopping $150.

The old expansion tank of the same size was allowing build-up of hydronic system water pressure. The T&P dribbled all the time. Installed this one in about 45 minutes. Now, the pressure goes up top 25 - 28 lbs and no higher. This is with a water temperature rise from about 115 degrees to 180 degrees.I'm thinking about buying another with just a bit bigger capacity to keep the hydronic water pressure below 120 lbs.